Guidelines For Configuring Vmans - Extreme Networks ExtremeWare XOS Guide Manual

Virtual LANs
NOTE
On the BlackDiamond 10K switch, the system also examines the packet's inner 802.1p tag and then directs the
packet to the appropriate egress queue on the egress port. See
Service (QoS) and configuring the 802.1p replacement feature.
NOTE
On the BlackDiamond 10K switch, all ports added to a specified VMAN must be in the same virtual router. For more
information on displaying, configuring, and using virtual routers, see
The system adds a 4-byte VMAN header on all packets, both originally tagged and untagged packets
arriving at the VMAN port.
NOTE
On the Black Diamond 10K switch, the system automatically enables the specified ports for jumbo frames when you
add ports to the VMANs. You must enable jumbo frames prior to configuring the VMANs on the Aspen 8810 switch.
The VMAN tunnel begins at the ingress, or customer access, port and terminates at the egress, or trunk,
port. Traffic flows from the egress trunk port onto the network thereafter without the VMAN tag.
Ensure that all the switch-to-switch ports in the VMAN tunnel are configured as tagged ports.
Configure the VMAN ingress, or customer access, port as an untagged port (although this port does
accept tagged packets). You must configure the VMAN tunnel egress, or trunk, port as an untagged port
so that the VMAN header is stripped from the frame.
NOTE
You must configure the VMAN tunnel egress, or trunk, port as untagged so that the VMAN header is stripped from
the frame.
Each tunnel port that accesses the user can support only one VMAN tunnel; the remaining ports
throughout the VMAN tunnel can support many VMANs.

Guidelines for Configuring VMANs

The following are some guidelines for configuring VMANs:
Duplicate customer's MAC address ingressing from multiple VMAN ports may disrupt the port
●
learning association process in the switch.
VMAN ports can belong to load-sharing groups. If any port in the load-sharing group is enabled for
●
VMAN, all ports in the group are automatically enabled to handle jumbo size frames. Also, VMAN
is automatically enabled on all ports of the untagged load-sharing group.
ExtremeWare XOS 11.1 Concepts Guide
Chapter 12 for more information on Quality of
Chapter 9.
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